CH-481
Separation and purification
Chemistry · Secondary 3 · Medium · Separation and purification
A student wants to obtain pure dry crystals of sodium chloride from a mixture of sodium chloride and sand. Which sequence of methods should be used?
- Filtration → evaporation → crystallisation
- Dissolving in water → filtration → evaporation to dryness
- Evaporation → filtration → dissolving in water
- Filtration → dissolving in water → evaporation to dryness
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